LauTextFileParser.cc

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// Copyright University of Warwick 2008 - 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// Authors:
// Thomas Latham
// John Back
// Paul Harrison

// Class for defining strings that can also handle numbers
// Useful for writing lines of output text that has a combination of
// words and numbers

#include "LauTextFileParser.hh"
#include "LauString.hh"

#include <fstream>

using std::cout;
using std::cerr;
using std::endl;

LauTextFileParser::LauTextFileParser(const char* s) :
        theFile_(s),
        totalLines_(0),
        lineNumber_(0)
{
}

LauTextFileParser::LauTextFileParser(const std::string& s) :
        theFile_(s),
        totalLines_(0),
        lineNumber_(0)
{
}

LauTextFileParser::LauTextFileParser(const TString& s) :
        theFile_(s.Data()),
        totalLines_(0),
        lineNumber_(0)
{
}

LauTextFileParser::~LauTextFileParser() 
{
        LineMap::iterator mapIter;
        for (mapIter = lineMap_.begin(); mapIter != lineMap_.end(); ++mapIter) {
                std::vector<std::string> line = mapIter->second;
                line.clear();
        }
        lineMap_.clear();
}

void LauTextFileParser::processFile()
{
        // Read the input file and store each (non-comment) line in the internal map.
        // Store the strings/numbers from each line in a vector, using a whitespace
        // separator to get each value.

        std::ifstream getData(theFile_.c_str());

        std::string whiteSpace(" ");
        int lineNo(0);

        cout<<"Processing input file "<<theFile_<<endl;

        // Loop while the input file is readable
        while (getData.good()) {

                if (getData.peek() == '\n') {

                        // Finish reading line
                        char c;
                        getData.get(c);

                        // Stop while loop if we have reached the end of the file
                        if (getData.eof()) {break;}

                } else if (getData.peek() == '#') {

                        // Skip comment line
                        getData.ignore(1000, '\n');
                        getData.putback('\n');

                        // Stop while loop if we have reached the end of the file
                        if (getData.eof()) {break;}

                } else {

                        // Read data line
                        char line[100];
                        getData.getline(line, 100);

                        // Stop while loop if we have reached the end of the file
                        if (getData.eof()) {break;}

                        LauString lineString(line);
                        // Split up the line according to white spaces
                        std::vector<std::string> lineVect = lineString.split(whiteSpace);

                        // Store this line in the internal map
                        lineMap_[lineNo] = lineVect;
                        lineNo++;

                }

        }

        totalLines_ = lineNo;
        cout<<"Finished storing "<<totalLines_<<" lines from "<<theFile_<<endl;
}

std::vector<std::string> LauTextFileParser::getNextLine()
{
        // Get the next line of white-space separated strings/numbers
        ++lineNumber_;

        std::vector<std::string> theLine = this->getLine(lineNumber_);
        return theLine;
}

std::vector<std::string> LauTextFileParser::getLine(int lineNo)
{
        // Retrieve the vector of white-space separated strings/numbers
        // for the given (non-commented) line number
        std::vector<std::string> line;

        LineMap::iterator mapIter = lineMap_.find(lineNo-1);
        if (mapIter != lineMap_.end()) {
                line = mapIter->second;
        }

        return line;
}